Certificate not being accepted by Mobile Phones from SBS 2011 Server

I have a problem with a SBS 2011 server where exchange is working fine for Outlook and Outlook anywhere but mobiles cant connect to server
I have used the Microsoft Test Connectivity site - Activesynch
it succesfully connects to server and succesfully obtains certificate but then fails with this error:

The certificate chain couldn't be built. You may be missing required intermediate certificates.

Does anyone have any thoughts or ideas I coudl persue to find the problem and resolve it
Thank you
lealtecAsked:
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Alan HardistyCo-OwnerCommented:
Are you using a 3rd party SSL certificate or a self-issued certificate?

If the former, then you should install the intermediate certificate from the certificate provider.  If the latter - then I would suggest you install a trusted 3rd party certificate.

Aaln
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